Citrus cultivation is an important horticultural activity and is an important contribution to the processed food industry. We have worked on a DNA virus infecting citrus plants in the southern states of India. We standardized the DNA extraction procedure for the detection method for an efficient diagnostic procedure for this virus (Borah et al., 2008). Subsequently, we analyzed the nucleotide sequence of the viruses affecting two citrus species, acid lime and pummelo (Borah et al., 2009a) and used PCR-RFLP method to analyze the viral diversity (Borah et al., 2009b). We have also analyzed the sequences of virus isolates from two other species, rough lemon and sweet orange (Johnson et al., 2012). We have standardized a LAMP procedure for the detection of citrus DNA viruses from citrus propagules (Johnson et al., 2014). We have also published a review on the genome structure of plant double-stranded DNA viruses (Borah et al., 2013).